US9408084B2 - Control method for radiation beam direction of wireless transmission device - Google Patents

Control method for radiation beam direction of wireless transmission device Download PDF

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Publication number
US9408084B2
US9408084B2 US14/284,670 US201414284670A US9408084B2 US 9408084 B2 US9408084 B2 US 9408084B2 US 201414284670 A US201414284670 A US 201414284670A US 9408084 B2 US9408084 B2 US 9408084B2
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Prior art keywords
mobile station
moving
radiation beam
sector
zone
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Expired - Fee Related, expires
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US14/284,670
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English (en)
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US20150200451A1 (en
Inventor
Ju-Derk PARK
Eun-hee Kim
Ho-Yong Kang
Cheol-Sig Pyo
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Electronics and Telecommunications Research Institute ETRI
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Electronics and Telecommunications Research Institute ETRI
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • H04W64/006—Locating users or terminals or network equipment for network management purposes, e.g. mobility management with additional information processing, e.g. for direction or speed determination

Definitions

  • the present invention relates to a method for controlling direction between a mobile wireless transmission device equipped with a direction control antenna and a fixed wireless transmission device.
  • An omni-directional antenna is generally used as a base station antenna in a mobile communication system to radiate or receive signals equally regardless of direction.
  • All signals transmitted or received to an antenna are transmitted or received by controlling power according to the distance to a transmission/reception antenna of a base station and interference is caused to transmitted or received desired signals.
  • an antenna of a base station cannot selectively transmit or receive signals.
  • a cell is divided into several sectors and several antennas are used to reduce such interferences. For example, when a cell is divided into 3 sectors and 3 antennas are used, each antenna is responsible for 120° which is able to reduce the interference by 1 ⁇ 3.
  • an antenna can be fixed to provide higher gain for the signals transmitted or received from a predetermined angle and provide less gain for the interference signals transmitted or received from different directions in order to reduce the interference.
  • this method can be efficient when a receiver/transmitter is fixed.
  • a smart antenna system is able to selectively transmit or receive signals of a desired direction to minimize interferences and thus significantly reduce interferences between subscribers. That is, an independent beam is provided to each terminal in a cell for receiving and transmitting and beam is provided to a desired terminal so that volume of radiation can be minimized to other direction terminals.
  • Such a smart antenna system is also able to minimize interfering noises between traffic channels to improve call qualities.
  • the smart antenna system is also able to provide radio wave to a desired direction so that each terminal is allowed for communications in low power.
  • An optimized beam forming technique is to build an array antenna in a base station to provide independently optimum weight to each subscriber.
  • the fixed station should control the direction according to the movement of the mobile station.
  • US 2013-0259005 discloses that a fixed station controls direction when a mobile station moves around.
  • US 2013-0259005 teaches that when RSSI (Received signal strength indicator) values between two terminals are compared, emission zone with higher value is selected.
  • RSSI Received signal strength indicator
  • An object of the present invention is to provide a method for controlling radiation beam direction of a transmission device which can predict and transmit moving direction by utilizing information about moving position and moving direction of a mobile station.
  • a control method for radiation beam direction of a wireless transmission device in a method for controlling radiation beam for a mobile station considerably moving around in the wireless transmission device comprising: updating and storing movement data of moving position and moving direction of the mobile station every time it moves by receiving sensor data in the mobile station; calculating a moving point to move by using the stored movement data of the mobile station by the wireless transmission device; determining a sector zone of radiation beam emission for the moving point to move; and controlling radiation beam for the mobile station by using the sector zone for the determined radiation beam emission in the wireless transmission device
  • the movement data may comprise moving angles and moving velocities of previous 3 points from each point where the mobile station has moved.
  • ⁇ n and V n are the moving angle and the moving velocity calculated at a current point, respectively, ⁇ n ⁇ 1 , V n ⁇ 1 ⁇ n ⁇ 2 , V n ⁇ 2 , ⁇ n ⁇ 3 , V n ⁇ 3 are moving angles and moving velocities of previous 3 points from each point where the mobile station has moved, respectively.
  • the step of calculating a moving point to move may further comprise calculating a point to move by using the moving angle and the moving velocity calculated at a current point.
  • the step of determining a sector zone for the radiation beam emission may comprise, after calculating the point of the mobile station to move, determining if the point to move is included in a directional sector zone or an omni directional sector zone.
  • the step of determining a sector zone for the radiation beam emission may comprise, after calculating the point of the mobile station to move, selecting preferentially an omni directional emission zone when the point to move is included in both a directional sector zone and an omni directional sector zone.
  • the step of controlling radiation beam may comprise emitting radiation beam in advance to the direction of the sector in which the point to move is included while maintaining the direction of the sector of the zone where the current point is included
  • the step of controlling radiation beam may comprise, when the point of the mobile station to move is determined, controlling radiation beam of the sector, where the mobile station is previously included, to be turned off.
  • a wireless transmission system providing services while moving around a particular area can expand service zones and improve communication qualities with control of radiation emission direction.
  • FIG. 1 illustrates communication service zones between a fixed station and a mobile station.
  • FIG. 2 illustrates moving paths and angles of a mobile station according to an embodiment of the present invention.
  • FIG. 3 is a flowchart illustrating a method for predicting moving path of a mobile station according to an embodiment of the present invention.
  • FIG. 4 illustrates examples of emission zone at each point and emission zone which is expected for next entry.
  • FIG. 1 illustrates communication service zones between a fixed station and a mobile station.
  • FIG. 1 illustrates emission zones when a mobile wireless transmission device 20 (hereinafter referred to as ‘mobile station’) moves considerably around a fixed wireless transmission device for control 10 (hereinafter referred to as ‘fixed station’) with a special movement path 30 .
  • mobile station a mobile wireless transmission device 20
  • fixed station a fixed wireless transmission device for control 10
  • the fixed station 10 is fixed on a particular position and an antenna provided thereon supports an omni directional emission zone 10 - 3 and a directional emission zone 10 - 4 .
  • the omni directional emission zone 10 - 3 of the present invention is defined as sector 0 and the directional emission zone 10 - 4 is defined as sector n , sector n+1 , sector n+2 , . . . (n is a natural number other than 1).
  • the mobile station 20 detects front direction at a current position in ⁇ t intervals ( 20 - 11 ) and moves along with a special movement path 30 .
  • a communication service zone between two wireless transmission devices having no direction control is limited to sector 0 10 - 3 which is the omni directional emission zone.
  • the communication service zone may be the area from sector 1 (S 1 ) to sector 6 (S 6 ).
  • the fixed station 10 should turn the emission direction from sector 0 (S 0 ) which is the omni directional emission zone to sector 2 (S 2 ) direction.
  • the emission direction should be turned from the sector 2 (S 2 ) to the sector 1 (S 1 ) direction.
  • the wireless transmission device for control should control the emission direction.
  • a sector from the sector 0 (S 0 ) and the sector 6 (S 6 ) should be selected.
  • the sector 0 (S 0 ), which is the omni directional emission zone, is selected. This is able to prevent extreme sector changes of the emission zone when it moves a short distance.
  • the fixed station 10 updates moving position and moving direction of the mobile station 20 every time it moves by receiving sensor data in the mobile station 20 in order to predict moving position and moving direction of the mobile station 20 .
  • the fixed station 10 predicts emission direction by using the updated movement data of the mobile station and uses it to control emission direction.
  • FIG. 2 illustrates moving path and angle of a mobile station according to an embodiment of the present invention.
  • an angle ⁇ 6 ′( 20 - 5 ) with next path should be predicted in order to predict the next path ( 20 - 4 ) and this angle may be calculated by the analogy of angles ⁇ 5 , ⁇ 4 , ⁇ 3 and so on of previous moving positions E, D, C and so on.
  • FIG. 3 is a flowchart illustrating a method for predicting moving path of a mobile station according to an embodiment of the present invention.
  • P n is the position at n moving time
  • ⁇ n and V n are moving angle and moving velocity, respectively, at P n position
  • sector 0 is an omni directional emission zone
  • sector n+1 is a predicted position at next time which is a directional emission zone where P n+1 is expected to be belonged.
  • the angle ⁇ 6 ′( 20 - 5 ) is calculated by utilizing previous angles of ⁇ 5 , ⁇ 4 , ⁇ 3 and so on at the positions of E, D, C and so on.
  • the velocity ( 20 - 7 ) between the moving positions may be also calculated by utilizing changes in the previous positions.
  • moving angle and moving velocity which is moving path at a current position of the mobile station may be calculated by using the following Equation 1 in Step 102 .
  • Equation 1 is an operation to predict an angle and a velocity by considering moving path of the mobile station according to an embodiment of the present invention.
  • ⁇ n ⁇ n ⁇ 1 +( ⁇ n ⁇ 2 ⁇ n ⁇ 3 )
  • V n V n ⁇ 1 +( V n ⁇ 2 ⁇ V n ⁇ 3 ) Equation 1
  • the moving angle ⁇ 6 ′ and the moving velocity V F at the F position which is the current position (P n ) in FIG. 2 , may be calculated by employing Equation 1.
  • ⁇ 6 ′ ⁇ 5 ,+( ⁇ 4 ⁇ 3 ),
  • V F V E +( V D ⁇ Vc )
  • the moving angle ⁇ 6 ′ and the moving velocity V F at F position of the mobile station 20 may be predicted by utilizing moving angles and moving velocities at 3 previous positions.
  • G position which is the next position (P n+1 )
  • G position which is the next position (P n+1 )
  • the G position may be determined if the zone where G is included is the next sector (S 6 ) zone or the sector 0 (S 0 ) zone which is the omni directional emission zone in Step 104 .
  • the fixed station 10 When it is determined that the zone where G is included is the next sector (S 6 ) zone, the fixed station 10 maintains the direction of the sector of the zone, where the current position F is included, and controls the antenna of the next sector, sector n+1 , direction to turn on to generate a directional beam in Step 105
  • the fixed station 10 maintains the direction of the sector of the zone, where the current position F is included, and controls the antenna of the sector 0 , which is the omni directional emission zone, direction to turn on to generate a directional beam in Step 106
  • the mobile station 20 may then move to the next moving position (P n+1 ) in Step 107 .
  • the antenna directing to sector n+1 may be controlled to be turned off in Step 108 .
  • the fixed station 10 emits radiation beam in advance to the direction of the next sector while maintaining the direction of the sector of the zone where the current F position is included to continuously maintain the connection between two wireless communication stations.
  • next position (P n+1 ) when the next position (P n+1 ) is included in both of the next sector (sector 6 ) zone and the sector 0 which is the omni directional emission zone, it may be programmed to select preferentially the sector 0 which is the omni directional emission zone.
  • the mobile station 20 When the mobile station 20 approaches closer to the fixed station 10 , since change in sector may be higher than that in distance, it may be programmed to select preferentially the sector 0 which is the omni directional emission zone to prevent extreme changes in sector.
  • a wireless communication system providing services by moving around a particular zone may expand service zones and improve communication qualities by controlling radiation emission direction.
  • a wireless communication device moving a zone which is divided into sectors, moves to another sector through controlling direction
  • it may solve problems associated with disconnection, reduce the time required for reconnection and increase reliability for spatial information acquisition in service zones by utilizing predicted moving positions in advance.
  • Use of the present invention allows communication services in much wider zones with limited resources (frequency bandwidth, radiation intensity) by applying to wireless communication services in the fields of sensor network system and internet of things (IoT).
  • IoT internet of things
  • FIG. 4 illustrates examples of emission zone at each point and emission zone which is expected for next entry.
  • change in emission zones at each moving position is in an order of sector 0 , sector 0 , sector 3 , sector 2 , sector 2 , sector 1 , sector 1 , sector 0 , sector 0 , sector 0 and the emission zone at next expected position from each moving position is in an order of sector 3 , sector 2 , sector 2 , sector 1 , sector 1 , sector 0 , sector 0 , sector 0 , sector 0 .

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
US14/284,670 2014-01-16 2014-05-22 Control method for radiation beam direction of wireless transmission device Expired - Fee Related US9408084B2 (en)

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KR1020140005700A KR102128400B1 (ko) 2014-01-16 2014-01-16 무선전송 장치의 전파 빔 방향 조정 방법
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FR3032320B1 (fr) * 2015-02-02 2017-02-17 Airbus Defence & Space Sas Procede et systeme de suppression d'un signal parasite recu par une charge utile d'un satellite
US10237754B1 (en) * 2017-05-12 2019-03-19 Sprint Spectrum L.P. Minimizing interference in different sectors of wireless networks

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US20150200451A1 (en) 2015-07-16
KR102128400B1 (ko) 2020-06-30

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